4zo3

AidC, a Dizinc Quorum-Quenching Lactonase, in complex with a product N-hexnoyl-L-homoserineAidC, a Dizinc Quorum-Quenching Lactonase, in complex with a product N-hexnoyl-L-homoserine

Structural highlights 4zo3 is a 2 chain structure with sequence from Chryseobacterium sp. StRB126. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: , Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function I7HB71_9FLAO Publication Abstract from PubMed Quorum-quenching catalysts are of interest for potential application as biochemical tools for interrogating interbacterial communication pathways, as antibiofouling agents, and as anti-infective agents in plants and animals. Herein, the structure and function of AidC, an N-acyl-l-homoserine lactone (AHL) lactonase from Chryseobacterium, is characterized. Steady-state kinetics show that zinc-supplemented AidC is the most efficient wild-type quorum-quenching enzymes characterized to date, with a kcat/KM value of approximately 2 x 106 M-1 s-1 for N-heptanoyl-l-homoserine lactone. The enzyme has stricter substrate selectivity and significantly lower KM values (ca. 50 muM for preferred substrates) compared to those of typical AHL lactonases (ca. >1 mM). X-ray crystal structures of AidC alone and with the product N-hexanoyl-l-homoserine were determined at resolutions of 1.09 and 1.67 A, respectively. Each structure displays as a dimer, and dimeric oligiomerization was also observed in solution by size-exclusion chromatography coupled with multiangle light scattering. The structures reveal two atypical features as compared to previously characterized AHL lactonases: a "kinked" alpha-helix that forms part of a closed binding pocket that provides affinity and enforces selectivity for AHL substrates and an active-site His substitution that is usually found in a homologous family of phosphodiesterases. Implications for the catalytic mechanism of AHL lactonases are discussed. Structural and Biochemical Characterization of AidC, a Quorum-Quenching Lactonase with Atypical Selectivity.,Mascarenhas R, Thomas PW, Wu CX, Nocek BP, Hoang QQ, Liu D, Fast W Biochemistry. 2015 Jul 8. PMID:26115006 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

spinqualitylabelsall models 4zo3, resolution 1.67Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image